When I first found out we were preggers again, I immediately went stroller shopping. My 2 faves were the
Kolcraft Contours Options tandem
http://www.kolcraft.com/product.aspx?id=149&&shopby=category
and Graco LX or LXI
http://www.gracobaby.com/products/subcategory.asp?N=44+10417+54&act=A20
My single stroller was a Graco Metrolite, so by comparison everything was unbearably heavy for me. I needed to get something as light as possible with a large sturdy basket and it had to be easy to set up, collapse, and manuever.
I ended up choosing the Kolcraft Contours Options tandem and haven't been disappointed yet (I've had it about 4 months). It is unbelieveably easy to manuever...very smooth ride. It is a bit heavy, but I don't think you'll find a lightweight double stroller. It fits easily in my Ford Expedition even with all seats up (there is absolutely NO cargo space when all seats are up...less than a sedan). I am now 5months preggo with my 2nd and can still get it in and out without too much trouble (though afterwards I need a 5 second breather, lol)
I also use it to go grocery shopping instead of a shopping cart, lol

. The basket is so large and sturdy. It's just easier for me to put dd in there.